The Swedish Navy is poking around the waters of the Stockholm archipelago after a mysterious submarine was sighted three times in the surrounding area over the past several days

A four-day search has turned up nothing thus far, but some Swedes are directing serious side-eye at Russia, whose military aircraft have continually violated Swedish air sovereignty over the past several months. In September, it prompted then-Swedish foreign minister to place a formal complaint with the nation’s Russian embassy, a rare flare of anger in Swedish foreign policy.

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